Research of Compression and Energy Absorption Characteristics of Polyimide Foam

The compression and energy absorption characteristic of polyimide foams with three different densities were analyzed in this paper. The compression properties were characterized by CMT7104 Electronic Universal Testing Machine, and the results show that the compressive stress at the same compressive strain increases with the foam density, and the stress-strain curves of polyimide foams with different densities were all composed of elastic region, plateau region and compacted region. The foams' ideal energy-absorption efficiency curves were obtained from their stress-strain curves, and all findings show that stress corresponding to at the peak of the energy-absorption efficiency was closed to the compaction stress of material, all their ideal energy-absorption efficiency can reach about 0.8. The polyimide foam is a kind of excellent energy-absorption material.